When your motor drive doesn't wind the film, don't panic and rush your MDrive for repair service. First, check the the shutter release pin which it must be in a retracted position when attaching the camera to the MD-11/MD-12. Detach the drive first, just mount the drive closely with the four electrical contact pin in contact with the metal surface at the base of the camera and this will activate the motor for a while and the shutter release pin will retract again if protruded earlier.